Oil-impregnated bearing powder metallurgy mixer and method of use thereof

Abstract

The application belongs to the technical field of powder metallurgy mixing, and particularly relates to an oil-containing bearing powder metallurgy mixing machine and a use method thereof, which comprises a machine shell and a plurality of mixing cavities arranged in the machine shell, a stirrer is rotationally arranged in each of the mixing cavities, a discharge pipe is fixedly arranged at the bottom of each of the mixing cavities, and an electric gate valve is arranged on the pipe wall of the discharge pipe, and the application further comprises a feeding cover. The oil-containing bearing powder is precisely screened and mixed through linkage of the grade screening mechanism and the mixing strength self-adjusting driving mechanism, and the performance of the oil-containing bearing product is improved. Meanwhile, the powder weighing mechanism cooperates with the mixing strength self-adjusting driving mechanism to adaptively adjust the stirring strength according to the amount of the oil-containing bearing powder, so that the product quality is guaranteed. In addition, the dust filtering mechanism cooperates with the mixing strength self-adjusting driving mechanism to effectively filter dust and optimize the working environment, so that the efficiency, quality and environmental protection of the oil-containing bearing powder metallurgy mixing are improved as a whole.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of powder metallurgy mixing, and particularly relates to an oil-impregnated bearing powder metallurgy mixing machine and a use method thereof. BACKGROUND

[0002] The oil-impregnated bearing is widely used in the fields of automobiles, household appliances and electric tools due to self-lubrication, low noise and good wear resistance. As a key process for preparing the oil-impregnated bearing, the powder metallurgy technology has a core link of a mixing process. Therefore, the use of the oil-impregnated bearing powder metallurgy mixing machine is crucial.

[0003] The current mixing machine generally adopts a cylindrical mixing structure, such as the powder metallurgy mixing machine disclosed in the announcement No. CN203091739U. However, in the mixing process, different particle sizes of the oil-impregnated bearing powder play different roles in the optimization of bearing performance. The existing equipment cannot realize the linkage of screening and mixing, so that the powder of different particle sizes cannot be accurately matched, the material performance advantage cannot be fully played, and finally the overall use performance of the oil-impregnated bearing is affected. In addition, different grades of oil-impregnated bearing powder have different requirements for mixing intensity. If the mixing intensity is too large, the oil-impregnated bearing powder is easily excessively crushed and refined, the original particle size distribution of the material is changed, the performance of the oil-impregnated bearing powder is damaged, and if the mixing intensity is too small, the material mixing is insufficient, and the stratification and segregation phenomenon occurs, resulting in poor mixing uniformity.

[0004] Therefore, the oil-impregnated bearing powder metallurgy mixing machine and the use method thereof are provided. SUMMARY

[0005] The purpose of the present application is to provide an oil-impregnated bearing powder metallurgy mixing machine and a use method thereof.

[0006] To achieve the above purpose, the following technical scheme is adopted: an oil-impregnated bearing powder metallurgy mixing machine, comprising a machine shell and a plurality of mixing cavities arranged in the machine shell, a stirrer is arranged in each of the mixing cavities, a discharge pipe is fixedly arranged at the bottom of each of the mixing cavities, and an electric gate valve is arranged on the pipe wall of the discharge pipe, further comprising:

[0007] A feeding cover is detachably arranged at the top of the machine shell, an grade screening mechanism is arranged in the feeding cover, the grade screening mechanism corresponds to the positions of the mixing cavities, and a feeding cover is arranged on one side of the top of the feeding cover.

[0008] A mixing intensity self-adjusting driving mechanism is arranged at the bottom of the machine shell, the mixing intensity self-adjusting driving mechanism is connected with the lower ends of the stirrers, and the mixing intensity self-adjusting driving mechanism is used to drive the rotation of the stirrers.

[0009] A plurality of powder weighing mechanisms are arranged at the bottom of the plurality of mixing cavities respectively, for weighing the screened powder;

[0010] A dust filtering mechanism is arranged on the sidewall of the casing and the feeding cover, and the dust filtering mechanism is connected with the mixing strength self-adjusting driving mechanism;

[0011] A PLC controller is fixedly arranged on the sidewall of the casing, and the electric gate valve, the mixing strength self-adjusting driving mechanism, the powder weighing mechanism and the dust filtering mechanism are electrically connected with the PLC controller.

[0012] Preferably, the grade screening mechanism comprises a screening plate fixedly arranged in the feeding cover, the surface of the screening plate and the positions corresponding to the plurality of mixing cavities are provided with first, second and third screening meshes, the inside of the feeding cover and the two sides of the upper surface of the screening plate are fixedly provided with partition plates, and guide cylinders are fixedly arranged between the top of the plurality of mixing cavities and the first, second and third screening meshes.

[0013] Preferably, the mixing strength self-adjusting driving mechanism comprises a base fixedly arranged at the bottom of the casing, a plurality of evenly distributed magnetic powder clutches are fixedly arranged at the bottom of the casing, the lower ends of the plurality of mixers extend to the bottom of the casing and are fixedly connected with the upper ends of the rotating shafts of the plurality of magnetic powder clutches respectively, the lower ends of the rotating shafts of the magnetic powder clutches on both sides are fixedly provided with first anti-falling sprockets, the lower ends of the rotating shafts of the magnetic powder clutches in the middle are fixedly provided with second anti-falling sprockets, a first chain is engaged between the two first anti-falling sprockets and the second anti-falling sprocket, a motor is fixedly arranged on one side of the top of the base, a driving shaft is fixedly arranged at the output end of the motor, and the upper end of the driving shaft is fixedly connected with the lower end of the rotating shaft of one of the magnetic powder clutches.

[0014] Preferably, the powder weighing mechanism comprises two weighing sensors symmetrically arranged at the bottom of the mixing cavity, and a sealing weighing plate is fixedly arranged at the top of the two weighing sensors and is sealingly and slidably arranged on the sidewall of the mixing cavity.

[0015] Preferably, a rubber hose is fixedly arranged on one side of the sealing weighing plate, the lower end of the rubber hose is fixedly connected with the upper end of the discharge pipe, and a sealing assembly is arranged between the shaft wall of the mixer and the middle part of the sealing weighing plate and the bottom of the casing.

[0016] Preferably, the dust filtering mechanism comprises a filtering box fixedly arranged on the side wall of the casing, a filter bag is fixedly arranged in the filtering box, an air suction fan blade is arranged in the filtering box below the filter bag, an air suction pipe is fixedly arranged between the top of the filtering box and the side wall of the feeding cover, an air exhaust pipe is fixedly arranged on one side of the bottom of the filtering box, a box cover is arranged on the top of the filtering box, an air inlet pipe is fixedly arranged on the side of the feeding cover away from the air suction pipe, a dustproof net is fixedly arranged in the air inlet pipe, and a linkage mechanism is arranged on the bottom of the filtering box.

[0017] Preferably, the linkage mechanism comprises a third anti-falling sprocket fixedly arranged on the driving shaft, a linkage shaft is rotatably arranged on the bottom of the filtering box, the upper end of the linkage shaft is fixedly connected with the air suction fan blade, a fourth anti-falling sprocket is fixedly arranged on the lower end of the linkage shaft, and a second chain is engaged between the third anti-falling sprocket and the fourth anti-falling sprocket.

[0018] Preferably, mounting pieces are arranged between the two sides of the casing and the two sides of the feeding cover, screw rods are fixedly arranged on the two sides of the casing and the two sides of the feeding cover, the two ends of the mounting pieces pass through the rod walls of the adjacent two screw rods, and the rod walls of the screw rods are provided with nuts matched with each other.

[0019] A use method of an oil-impregnated bearing powder metallurgy mixing machine, comprising the following steps:

[0020] S1. Preparation, turn on the power supply of the device to power the entire equipment, then operate the PLC controller to start the motor and the weighing sensor, so that the motor enters the standby state, and the weighing sensor is ready for weight measurement;

[0021] S2. Powder screening, open the feeding cover, insert the oil-impregnated bearing powder containing pipe into the feeding port of the feeding cover, and let the oil-impregnated bearing powder fall on the inclined screening plate. Due to the inclination of the screening plate, the oil-impregnated bearing powder will pass through the first screening net, the second screening net and the third screening net in turn, so that the oil-impregnated bearing powder can be graded and screened. The screened oil-impregnated bearing powder falls into the interior of the mixing cavity at different positions through the guide cylinder;

[0022] S3. Mixing and stirring intensity adjustment, after the motor is started, the motor runs at a constant power to drive the driving shaft to rotate, the driving shaft drives the rotating shaft of a magnetic powder clutch connected thereto to rotate, through the transmission of the first anti-falling sprocket, the second anti-falling sprocket and the first chain, the rotating shafts of a plurality of magnetic powder clutches rotate, and in turn drive the stirrer installed on the upper end to rotate, so as to stir and mix the oil-impregnated bearing powder in the mixing cavity. As the screening continues, the oil-impregnated bearing powder in the mixing cavity increases, and the weight value increases. The PLC controller adjusts the output current according to the received weight change, changes the excitation current of the magnetic powder clutch, and when the amount of oil-impregnated bearing powder increases, the PLC controller increases the output current to increase the excitation current of the magnetic powder clutch and speed up the rotation speed of the stirrer, so as to realize self-adaptive adjustment of the stirring intensity and ensure the product quality.

[0023] S4. Dust treatment and discharge, when the motor drives the driving shaft to rotate, the third anti-falling sprocket installed on the driving shaft rotates, the third anti-falling sprocket drives the fourth anti-falling sprocket to rotate through the second chain, so that the linkage shaft rotates, and in turn drives the exhaust fan blade to rotate, so that a negative pressure is formed in the exhaust pipe to suck the dust gas in the feeding cover into the exhaust pipe. After the dust gas enters the filter box, it is filtered by the filter bag, and the clean gas is discharged through the exhaust pipe.

[0024] Compared with the prior art, the beneficial effects of the present application are that:

[0025] Through the setting of the grade screening mechanism and the mixing intensity self-adjusting driving mechanism, the inclination design of the screening plate and the first screening net, the second screening net and the third screening net with the hole diameter increasing in turn can screen the oil-impregnated bearing powder by grade, and the screened oil-impregnated bearing powder directly falls into the corresponding mixing cavity. At the same time, the mixing intensity self-adjusting driving mechanism drives the stirrer to stir and mix the oil-impregnated bearing powder in each mixing cavity, realizes the linkage of screening and mixing, accurately adjusts the oil-impregnated bearing powder of different particle sizes, fully utilizes the material performance advantages, and effectively improves the use performance of the oil-impregnated bearing product.

[0026] Through the cooperation of the powder weighing mechanism and the mixing intensity self-adjusting driving mechanism, the weight of the oil-impregnated bearing powder in the mixing cavity is measured in real time, and the data is transmitted to the PLC controller. The PLC controller adjusts the excitation current of the magnetic powder clutch by changing the output current according to the weight value change, and in turn adjusts the rotation speed of the stirrer, so as to realize self-adaptive adjustment of the stirring intensity. The problems that the oil-impregnated bearing powder is excessively broken due to excessive stirring intensity, which affects the internal structure and performance, and the mixing is uneven due to insufficient stirring intensity are avoided, so as to ensure the stability and consistency of the product quality.

[0027] Through the linkage of the set dust filtering mechanism and the mixing strength self-adjusting driving mechanism, the motor operation drives the suction fan blade to rotate, the dust gas in the feeding cover is sucked into the filter box, the clean gas is discharged after being filtered by the filter bag, the air inlet pipe maintains the air pressure balance in the feeding cover, the filter screen in the air inlet pipe blocks the external dust from entering, the suction strength is small in the whole process, the secondary raising of the oil bearing powder is avoided, the working environment is optimized, and the adverse effect of the dust on the product quality is prevented. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 is a first perspective view of the oil bearing powder metallurgy mixing machine provided by the present application;

[0029] Figure 2 is a second perspective view of the oil bearing powder metallurgy mixing machine provided by the present application;

[0030] Figure 3 is a perspective view of the top of the feeding cover of the oil bearing powder metallurgy mixing machine provided by the present application;

[0031] Figure 4 is a perspective view of the casing and the feeding cover of the oil bearing powder metallurgy mixing machine provided by the present application;

[0032] Figure 5 is a perspective view of the mixing strength self-adjusting driving mechanism of the oil bearing powder metallurgy mixing machine provided by the present application;

[0033] Figure 6 is a perspective view of the powder weighing mechanism in the mixing cavity of the oil bearing powder metallurgy mixing machine provided by the present application;

[0034] Figure 7 is a perspective view of the dust filtering mechanism of the oil bearing powder metallurgy mixing machine provided by the present application.

[0035] In the diagram: 1. Casing; 2. Mixing chamber; 3. Agitator; 4. Discharge pipe; 5. Electric gate valve; 6. Feed hood; 7. Grade screening mechanism; 71. Screening plate; 72. First screening mesh; 73. Second screening mesh; 74. Third screening mesh; 75. Divider plate; 76. Guide cylinder; 8. Feed cover; 9. Mixing intensity self-adjusting drive mechanism; 91. Base; 92. Magnetic powder clutch; 93. First anti-drop sprocket; 94. Second anti-drop sprocket; 95. First chain; 96. Motor; 97. Drive shaft; 10. Powder weighing mechanism. 101 Weighing sensor, 102 Sealed weighing plate, 103 Rubber hose, 11 Dust filtration mechanism, 111 Filter box, 112 Filter bag, 113 Exhaust fan blade, 114 Exhaust duct, 115 Exhaust pipe, 116 Box cover, 117 Inlet duct, 118 Dustproof net, 12 PLC controller, 13 Linkage mechanism, 131 Third anti-drop sprocket, 132 Linkage shaft, 133 Fourth anti-drop sprocket, 134 Second chain, 14 Mounting plate, 15 Screw, 16 Nut. Detailed Implementation

[0036] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0037] like Figures 1-7 As shown, an oil-impregnated bearing powder metallurgy mixer includes a housing 1 and multiple mixing chambers 2 disposed inside the housing 1. Each mixing chamber 2 is equipped with a rotatable agitator 3. Each mixing chamber 2 has a discharge pipe 4 fixedly installed at its bottom, and the discharge pipe 4 has an electric gate valve 5 installed on its wall. The mixer also includes:

[0038] The feed hood 6 is detachably mounted on the top of the housing 1. Mounting plates 14 are provided between the two sides of the housing 1 and the two sides of the feed hood 6. Screws 15 are fixedly mounted on both sides of the housing 1 and the two sides of the feed hood 6. The two ends of the mounting plates 14 pass through the rod walls of two adjacent screws 15, and the rod walls of the screws 15 are provided with mutually cooperating nuts 16. When it is necessary to clean the inside of the mixing chamber 2 or the first screening screen 72, the second screening screen 73 and the third screening screen 74, the operator loosens the nuts 16 with a wrench and removes the mounting plates 14 from the screws 15, so that the feed hood 6 can be detached from the housing 1.

[0039] The inside of the feeding cover 6 is provided with a grading screening mechanism 7 corresponding to the positions of the plurality of mixing cavities 2, and the top side of the feeding cover 6 is provided with a feeding cover 8 which is sealingly hinged to the feeding port at the top of the feeding cover 6. The grading screening mechanism 7 comprises a screening plate 71 which is fixedly arranged in the inside of the feeding cover 6 at an inclination, and the surface of the screening plate 71 and the positions corresponding to the plurality of mixing cavities 2 are provided with a first screening net 72, a second screening net 73 and a third screening net 74. The inside of the feeding cover 6 and the two sides of the upper surface of the screening plate 71 are fixedly provided with a partition plate 75. The top of the plurality of mixing cavities 2 and between the first screening net 72, the second screening net 73 and the third screening net 74 are fixedly provided with a guide cylinder 76. The oil-containing bearing powder is discharged to the surface of the screening plate 71, and the oil-containing bearing powder automatically flows downward along the inclined surface of the screening plate 71 and sequentially passes through the first screening net 72, the second screening net 73 and the third screening net 74. Since the pore diameters of the first screening net 72, the second screening net 73 and the third screening net 74 are sequentially increased, the oil-containing bearing powder can be graded and screened.

[0040] The mixing strength self-adjusting drive mechanism 9 is arranged at the bottom of the casing 1, and the mixing strength self-adjusting drive mechanism 9 is connected to the lower ends of the plurality of mixers 3 and is used to drive the plurality of mixers 3 to rotate. The mixing strength self-adjusting drive mechanism 9 comprises a base 91 which is fixedly arranged at the bottom of the casing 1. The bottom of the casing 1 is fixedly provided with a plurality of evenly distributed magnetic powder clutches 92. The lower ends of the plurality of mixers 3 extend to the bottom of the casing 1 and are respectively fixedly connected to the upper ends of the rotating shafts of the plurality of magnetic powder clutches 92. The lower ends of the rotating shafts of the two magnetic powder clutches 92 are fixedly provided with first anti-falling sprockets 93. The lower end of the rotating shaft of the middle magnetic powder clutch 92 is fixedly provided with a second anti-falling sprocket 94. The first anti-falling sprockets 93 and the second anti-falling sprocket 94 are meshingly provided with a first chain 95. The top side of the base 91 is fixedly provided with a motor 96, and the output end of the motor 96 is fixedly provided with a drive shaft 97. The upper end of the drive shaft 97 is fixedly connected to the lower end of the rotating shaft of one of the magnetic powder clutches 92. The motor 96 can drive the drive shaft 97 to rotate, and the drive shaft 97 in turn drives the rotating shaft of the magnetic powder clutch 92 to rotate. Since the rotating shafts of the plurality of magnetic powder clutches 92 are connected through the first anti-falling sprockets 93, the second anti-falling sprocket 94 and the second chain 134, the rotation of the rotating shaft of one magnetic powder clutch 92 can drive the rotating shafts of the plurality of magnetic powder clutches 92 to rotate. At the same time, the mixers 3 installed at the upper ends of the rotating shafts of the plurality of magnetic powder clutches 92 will also rotate and agitate and mix the oil-containing bearing powder in the plurality of mixing cavities 2.

[0041] A plurality of powder weighing mechanisms 10 are arranged at the bottom of the plurality of mixing cavities 2 respectively, and are used for weighing the screened powder. The powder weighing mechanism 10 comprises two weighing sensors 101 symmetrically arranged at the bottom of the mixing cavity 2. The top of the two weighing sensors 101 is fixedly provided with a sealing weighing plate 102 which is sealingly and slidingly arranged with the side wall of the mixing cavity 2. The sealing weighing plate 102 can slightly slide up and down in the interior of the mixing cavity 2, so as to ensure that the oil-bearing bearing powder falling on the surface of the sealing weighing plate 102 is weighed. The sealing sliding structure will not cause the oil-bearing bearing powder to fall into the gap. One side of the sealing weighing plate 102 is fixedly provided with a rubber hose 103, and the lower end of the rubber hose 103 is fixedly connected with the upper end of the discharge pipe 4. The rubber hose 103 can provide space for the sealing weighing plate 102 to move up and down, and will not affect the oil-bearing bearing powder falling into the interior of the discharge pipe 4. The shaft wall of the stirrer 3, the middle part of the sealing weighing plate 102 and the bottom of the casing 1 are all provided with sealing assemblies. The sealing assemblies can increase the sealing between the stirrer 3 and the sealing weighing plate 102 and the casing 1.

[0042] The dust filtering mechanism 11 is arranged on the side wall of the casing 1 and the feeding cover 6, and is connected with the mixing strength self-adjusting driving mechanism 9. The dust filtering mechanism 11 comprises a filtering box 111 fixedly arranged on the side wall of the casing 1. A filter bag 112 is fixedly arranged in the filtering box 111. A suction fan blade 113 is arranged in the filtering box 111 below the filter bag 112. A suction pipe 114 is fixedly arranged between the top of the filtering box 111 and the side wall of the feeding cover 6. An exhaust pipe 115 is fixedly arranged on one side of the bottom of the filtering box 111. A box cover 116 is arranged on the top of the filtering box 111. The box cover 116 and the top of the filtering box 111 are sealingly hingedly arranged. The box cover 116 and the filtering box 111 are provided with a fixed lock buckle. An air inlet pipe 117 is fixedly arranged on the side of the feeding cover 6 away from the suction pipe 114. A dustproof net 118 is fixedly arranged in the air inlet pipe 117. The bottom of the filtering box 111 is provided with a linkage mechanism 13. The linkage mechanism 13 comprises a third anti-falling sprocket 131 fixedly arranged on the driving shaft 97. A linkage shaft 132 is rotatably arranged on the bottom of the filtering box 111. The upper end of the linkage shaft 132 is fixedly connected with the suction fan blade 113. A fourth anti-falling sprocket 133 is fixedly arranged on the lower end of the linkage shaft 132. The third anti-falling sprocket 131 and the fourth anti-falling sprocket 133 are meshingly provided with a second chain 134. The motor 96 can drive the driving shaft 97 to rotate. The third anti-falling sprocket 131 connected with the driving shaft 97 also rotates. The third anti-falling sprocket 131 is connected with the fourth anti-falling sprocket 133 through the second chain 134, thereby driving the fourth anti-falling sprocket 133 to synchronously rotate. The rotation of the fourth anti-falling sprocket 133 drives the linkage shaft 132 to rotate. The upper end of the linkage shaft 132 is connected with the suction fan blade 113. With the rotation of the linkage shaft 132, the suction fan blade 113 starts to operate. When the suction fan blade 113 rotates, the gas in the filtering box 111 is quickly discharged to the outside through the exhaust pipe 115. In this process, a negative pressure state is formed in the suction pipe 114. Since the end of the suction pipe 114 is connected with the feeding cover 6, the negative pressure can suck the dust gas in the feeding cover 6 into the suction pipe 114. The dust gas enters the filtering box 111 through the suction pipe 114. After the filtering treatment of the filter bag 112, the clean gas is discharged to the outside environment through the exhaust pipe 115.

[0043] The PLC controller 12 is fixedly arranged on the side wall of the casing 1. The electric gate valve 5, the mixing strength self-adjusting driving mechanism 9, the powder weighing mechanism 10 and the dust filtering mechanism 11 are electrically connected with the PLC controller 12.

[0044] The operating principle of the present application is described as follows: the staff first connects the power supply of the device, then manually operates the PLC controller 12 to start the motor 96 and the weighing sensor 101, then manually opens the feeding cover 8, extends the oil-bearing bearing powder feeding pipe into the feeding port of the feeding cover 8, and makes the oil-bearing bearing powder feed to the surface of the screening plate 71. Since the screening plate 71 is arranged in an inclined manner, the oil-bearing bearing powder will automatically flow downward along the inclined surface of the screening plate 71 and pass through the first screening net 72, the second screening net 73 and the third screening net 74 in turn. Since the pore sizes of the first screening net 72, the second screening net 73 and the third screening net 74 increase in turn, the oil-bearing bearing powder can be graded and screened, and the screened oil-bearing bearing powder will fall into different mixing cavities 2;

[0045] The motor 96 rotates at a constant power after starting, and the motor 96 drives the driving shaft 97 to rotate, which in turn drives the rotating shaft of one of the magnetic powder clutches 92 to rotate. Since the rotating shafts of the plurality of magnetic powder clutches 92 are connected through the first anti-falling sprocket 93, the second anti-falling sprocket 94 and the second chain 134, the rotation of the rotating shaft of one magnetic powder clutch 92 can drive the rotating shafts of the plurality of magnetic powder clutches 92 to rotate. At the same time, the stirrers 3 installed on the upper ends of the rotating shafts of the plurality of magnetic powder clutches 92 will also rotate. During the rotation of the plurality of stirrers 3, the oil-bearing bearing powder in the plurality of mixing cavities 2 can be stirred and mixed, so that the oil-bearing bearing powder can be graded and mixed, and the oil-bearing bearing powder of different particle sizes can be accurately matched, so that the oil-bearing bearing powder can fully exert its performance advantages, and the use performance of the oil-bearing bearing product is improved;

[0046] When the screened oil-containing bearing powder falls into the mixing cavity 2, it will fall on the upper surface of the sealed weighing plate 102, and the lower surface of the sealed weighing plate 102 is provided with a weighing sensor 101, which can measure the weight of the sealed weighing plate 102 and the weight of the oil-containing bearing powder falling thereon. The weighing sensor 101 converts the detected weight value into an electrical signal and sends it to the PLC controller 12. As the grade screening continues, the amount of oil-containing bearing powder falling into the mixing cavity 2 gradually increases, and the weight value detected by the weighing sensor 101 also increases accordingly. The PLC controller 12 controls the magnetic powder clutch 92 at the bottom of the mixing cavity 2 according to the received weight value change. The PLC controller 12 adjusts the excitation current of the magnetic powder clutch 92 by changing the size of the output current. The change of the excitation current changes the magnetic state of the magnetic powder inside the magnetic powder clutch 92, and then changes the friction between the driving part and the driven part of the clutch. When the amount of oil-containing bearing powder increases and the weight value detected by the weighing sensor 101 increases, the PLC controller 12 correspondingly increases the output current, so that the excitation current of the magnetic powder clutch 92 increases (the initial input current of the magnetic powder clutch 92 is small, so the initial stirring speed of the stirrer 3 is slow to avoid a small amount of oil-containing bearing powder falling into high-intensity stirring and mixing). The binding force between the magnetic powders is stronger, and the friction between the driving part and the driven part of the magnetic powder clutch 92 is increased. In this way, the driven part (i.e. the rotating shaft where the stirrer 3 is located) can rotate more quickly with the driving part, thereby increasing the speed of the stirrer 3. By adaptively adjusting the stirring intensity of the stirrer 3 according to the amount of oil-containing bearing powder, the problem of excessive or insufficient stirring intensity of the stirrer 3 can be effectively avoided. Excessive stirring intensity may cause excessive crushing of the oil-containing bearing powder, affecting its internal structure and performance and reducing product quality. On the other hand, insufficient stirring intensity cannot fully mix the oil-containing bearing powder, resulting in uneven mixing and affecting the quality stability and consistency of the product. By adaptively adjusting the stirring intensity, the quality of the product can be ensured.

[0047] In the process of the motor 96 driving the driving shaft 97 to rotate, the third anti-falling sprocket 131 connected therewith also rotates, the third anti-falling sprocket 131 is connected with the fourth anti-falling sprocket 133 through the second chain 134, and then drives the fourth anti-falling sprocket 133 to rotate synchronously, the rotation of the fourth anti-falling sprocket 133 makes the linkage shaft 132 also rotate, the upper end of the linkage shaft 132 is connected with the exhaust fan blade 113, with the rotation of the linkage shaft 132, the exhaust fan blade 113 starts to operate, when the exhaust fan blade 113 rotates, the gas in the filter box 111 is quickly discharged to the outside through the exhaust pipe 115, in this process, a negative pressure state is formed in the exhaust pipe 114, since the end of the exhaust pipe 114 is connected with the feeding cover 6, the negative pressure will suck the dust gas in the feeding cover 6 into the exhaust pipe 114, the dust gas enters the inside of the filter box 111 along the exhaust pipe 114, after the filtering treatment of the filter bag 112, the clean gas is discharged to the outside environment through the exhaust pipe 115, while the dust gas in the feeding cover 6 is exhausted, the air inlet pipe 117 on the other side of the feeding cover 6 plays a role, and the external gas is discharged into the feeding cover 6, so as to ensure the air pressure balance in the feeding cover 6, since the filter screen is arranged in the air inlet pipe 117, the dust in the external gas can be effectively blocked, and the possibility of entering the inside of the feeding cover 6 is reduced, in the whole process of sucking the dust gas, the suction intensity of the gas is small, and the airflow is relatively soft, so that the phenomenon of secondary lifting of the oil-impregnated bearing powder is not caused, and the adverse effects on the working environment and product quality are avoided, in the process of continuously filtering the dust gas, the dust gas continuously passes through the filter bag 112, and the powder particles accumulated in the filter bag 112 will be more and more, when the accumulation reaches a certain degree, the accumulated powder particles in the filter bag 112 can be cleaned by only opening the box cover 116 at the top of the filter box 111, so that the filter bag 112 can always maintain good filtering performance and maintain the efficient operation of the whole filtering system.

[0048] After the oil-impregnated bearing powder completes the grade selection and mixing process, the staff controls the electric gate valve 5 by manually operating the PLC controller 12, at this time, the valve plate in the electric gate valve 5 is opened under the instruction of the controller, and the oil-impregnated bearing powder in the mixing cavity 2 is discharged to the outside through the discharge pipe 4.

[0049] The above only describes the preferred embodiments of the present application and is not intended to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An oil bearing powder metallurgy mixer, comprising a casing (1) and a plurality of mixing cavities (2) arranged inside the casing (1), a stirrer (3) is rotatably arranged inside each of the mixing cavities (2), a discharge pipe (4) is fixedly arranged at the bottom of each of the mixing cavities (2), and an electric gate valve (5) is arranged on the pipe wall of the discharge pipe (4), characterized in that, Also include: The feeding cover (6) is detachably arranged at the top of the shell (1), the inside of the feeding cover (6) is provided with a grade screening mechanism (7), the grade screening mechanism (7) corresponds to the position of the plurality of mixing cavities (2), one side of the top of the feeding cover (6) is provided with a feeding cover (8); The mixing strength self-adjusting drive mechanism (9) is arranged at the bottom of the shell (1), the mixing strength self-adjusting drive mechanism (9) is connected with the lower end of the plurality of mixers (3), and the mixing strength self-adjusting drive mechanism (9) is used to drive the plurality of mixers (3) to rotate; A plurality of powder weighing mechanisms (10) are arranged at the bottom of the plurality of mixing cavities (2) respectively, and are used for weighing the screened powder; The dust filtering mechanism (11) is arranged on the side wall of the shell (1) and the feeding cover (6), and the dust filtering mechanism (11) is connected with the mixing strength self-adjusting drive mechanism (9); The PLC controller (12) is fixedly arranged on the side wall of the shell (1), and the electric gate valve (5), the mixing strength self-adjusting drive mechanism (9), the powder weighing mechanism (10) and the dust filtering mechanism (11) are electrically connected with the PLC controller (12); The grade screening mechanism (7) includes a screening plate (71) obliquely and fixedly arranged in the inside of the feeding cover (6), the surface of the screening plate (71) and the positions corresponding to the plurality of mixing cavities (2) are provided with a first screening net (72), a second screening net (73) and a third screening net (74), the inside of the feeding cover (6) and the upper surfaces of the two sides of the screening plate (71) are fixedly provided with a partition plate (75), and the top of the plurality of mixing cavities (2) and the first screening net (72), the second screening net (73) and the third screening net (74) are fixedly provided with a material guiding cylinder (76); The mixing strength self-adjusting drive mechanism (9) includes a base (91) fixedly arranged at the bottom of the shell (1), a plurality of magnetic powder clutches (92) are fixedly arranged at the bottom of the shell (1), the lower ends of the plurality of mixers (3) extend to the bottom of the shell (1) and are fixedly connected with the upper ends of the rotating shafts of the plurality of magnetic powder clutches (92), the lower ends of the rotating shafts of the two magnetic powder clutches (92) are fixedly provided with a first anti-falling sprocket (93), the lower end of the rotating shaft of the magnetic powder clutch (92) in the middle is fixedly provided with a second anti-falling sprocket (94), a first chain (95) is engaged between the two first anti-falling sprockets (93) and the second anti-falling sprocket (94), a motor (96) is fixedly arranged at one side of the top of the base (91), and a driving shaft (97) is fixedly arranged at the output end of the motor (96), and the upper end of the driving shaft (97) is fixedly connected with the lower end of the rotating shaft of one of the magnetic powder clutches (92).

2. The oil-impregnated bearing powder metallurgy mixer according to claim 1, characterized in that The powder weighing mechanism (10) comprises two weighing sensors (101) symmetrically arranged at the bottom of the mixing cavity (2), and the top of each weighing sensor (101) is fixedly provided with a sealing weighing plate (102) which is sealingly and slidably arranged on the side wall of the mixing cavity (2).

3. An oil-impregnated bearing powder metallurgy mixer according to claim 2, characterized in that One side of the sealing weighing plate (102) is fixedly provided with a rubber hose (103), and the lower end of the rubber hose (103) is fixedly connected with the upper end of the discharge pipe (4). The shaft wall of the stirrer (3) and the middle part of the sealing weighing plate (102) and the bottom of the machine shell (1) are all provided with sealing assemblies.

4. The oil-impregnated bearing powder metallurgy mixer according to claim 3, characterized in that The dust filtering mechanism (11) comprises a filtering box (111) fixedly arranged on the side wall of the machine shell (1), a filter bag (112) fixedly arranged in the filtering box (111), an air suction fan blade (113) arranged in the filtering box (111) below the filter bag (112), an air suction pipe (114) fixedly arranged between the top of the filtering box (111) and the side wall of the feeding cover (6), an air exhaust pipe (115) fixedly arranged on one side of the bottom of the filtering box (111), a box cover (116) arranged on the top of the filtering box (111), an air inlet pipe (117) fixedly arranged on the side of the feeding cover (6) away from the air suction pipe (114), a dustproof net (118) fixedly arranged in the air inlet pipe (117), and a linkage mechanism (13) arranged on the bottom of the filtering box (111).

5. An oil-impregnated bearing powder metallurgy mixer according to claim 4, characterized in that The linkage mechanism (13) comprises a third anti-falling sprocket (131) fixedly arranged on the driving shaft (97), a linkage shaft (132) rotatably arranged on the bottom of the filtering box (111), the upper end of the linkage shaft (132) is fixedly connected with the air suction fan blade (113), the lower end of the linkage shaft (132) is fixedly provided with a fourth anti-falling sprocket (133), and the third anti-falling sprocket (131) and the fourth anti-falling sprocket (133) are engaged with a second chain (134).

6. The oil-impregnated bearing powder metallurgy mixer of claim 1 wherein, Mounting pieces (14) are arranged between the two sides of the machine shell (1) and the two sides of the feeding cover (6), screw rods (15) are fixedly arranged on the two sides of the machine shell (1) and the two sides of the feeding cover (6), the two ends of each mounting piece (14) pass through the rod walls of two adjacent screw rods (15), and the rod walls of the screw rods (15) are provided with nuts (16) which cooperate with each other.

7. A method of using a powder metallurgy mixer for oil-impregnated bearings as claimed in claim 5, characterized in that The use method comprises the following steps: S1. Preparation, turn on the power supply of the device to power the entire equipment, then start the motor (96) and the weighing sensor (101) by operating the PLC controller (12), so that the motor (96) enters the standby state and the weighing sensor (101) is ready for weight measurement; S2. Powder screening, open the feed cover (8), insert the powder containing oil bearing powder containing tube into the feed port of the feed cover (8), and let the powder containing oil bearing powder fall on the inclined screening plate (71). Due to the inclination of the screening plate (71), the powder containing oil bearing powder will pass through the first screening net (72), the second screening net (73) and the third screening net (74) in turn, so that the powder containing oil bearing powder can be graded and screened, and the screened powder containing oil bearing powder falls into the inside of the mixing cavity (2) at different positions through the guide cylinder (76); S3. Mixing and stirring intensity adjustment, after the motor (96) is started, it runs at constant power, drives the driving shaft (97) to rotate, the driving shaft (97) drives the rotating shaft of a magnetic powder clutch (92) connected thereto to rotate, through the transmission of the first anti-falling sprocket (93), the second anti-falling sprocket (94) and the first chain (95), the rotating shafts of multiple magnetic powder clutches (92) rotate, and in turn drive the stirrer (3) installed on the upper end thereof to rotate, so as to stir and mix the powder containing oil bearing powder in the mixing cavity (2). With the continuous screening, the powder containing oil bearing powder in the mixing cavity (2) increases, and the weight value increases. The PLC controller (12) adjusts the output current according to the received weight change, changes the exciting current of the magnetic powder clutch (92), when the amount of powder containing oil bearing powder increases, the PLC controller (12) increases the output current, so that the exciting current of the magnetic powder clutch (92) increases, and the rotating speed of the stirrer (3) increases, realizing the self-adaptive adjustment of the stirring intensity, and ensuring the product quality; S4. Dust treatment and discharge, when the motor (96) drives the driving shaft (97) to rotate, the third anti-falling sprocket (131) installed on the driving shaft (97) rotates, the third anti-falling sprocket (131) drives the fourth anti-falling sprocket (133) to rotate through the second chain (134), so that the linkage shaft (132) rotates, and in turn drives the exhaust fan blade (113) to rotate, so that the negative pressure is formed in the exhaust pipe (114), the dust gas in the feed cover (6) is sucked into the exhaust pipe (114), after the dust gas enters the filter box (111), it is filtered by the filter bag (112), and the clean gas is discharged through the exhaust pipe (115).

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